added button group dropdowns

framework/yii/bootstrap/Button.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\bootstrap;
+
+use yii\base\InvalidConfigException;
+use yii\helpers\Html;
+
+
+/**
+ * Button renders a group or split button dropdown bootstrap component.
+ *
+ * For example,
+ *
+ * ```php
+ * // a button group using Dropdown widget
+ * echo \yii\bootstrap\Button::widget(array(
+ *     'label' => 'Action',
+ *     'items' => Dropdown::widget(array(
+ *         'clientOptions' => false,
+ *             'items' => array(
+ *                 array(
+ *                     'label' => 'DropdownA',
+ *                     'url' => '/',
+ *                 ),
+ *                 array(
+ *                     'label' => 'DropdownB',
+ *                     'url' => '#',
+ *                 ),
+ *              ),
+ *         ),
+ *      ),
+ * ));
+ *
+ * // split button group using `items` dropdown configuration
+ * echo \yii\bootstrap\Button::widget(array(
+ *     'label' => 'Action',
+ *     'split' => true,
+ *     'items' => array(
+ *         array(
+ *             'label' => 'DropdownA',
+ *             'url' => '/',
+ *         ),
+ *         array(
+ *             'label' => 'DropdownB',
+ *             'url' => '#',
+ *         ),
+ *      ),
+ * ));
+ * ```
+ * @see http://twitter.github.io/bootstrap/javascript.html#buttons
+ * @see http://twitter.github.io/bootstrap/components.html#buttonDropdowns
+ * @author Antonio Ramirez <amigo.cobos@gmail.com>
+ * @since 2.0
+ */
+class Button extends Widget
+{
+	/**
+	 * @var string the button label
+	 */
+	public $label;
+	/**
+	 * @var array list of menu items in the dropdown. Each array element represents a single
+	 * menu with the following structure:
+	 *
+	 * - label: string, required, the label of the item link
+	 * - url: string, optional, the url of the item link. Defaults to "#".
+	 * - linkOptions: array, optional, the HTML attributes of the item link.
+	 * - options: array, optional, the HTML attributes of the item.
+	 * - items: array, optional, the dropdown items configuration array.
+	 *
+	 * @see https://github.com/twitter/bootstrap/issues/5050#issuecomment-11741727
+	 * @see [[Dropdown]]
+	 */
+	public $items = array();
+	/**
+	 * @var boolean whether to display a group or split styled button group.
+	 */
+	public $split = false;
+	/**
+	 * @var boolean whether the labels for dropdown items should be HTML-encoded.
+	 */
+	public $encodeLabels = true;
+
+
+	/**
+	 * Initializes the widget.
+	 * If you override this method, make sure you call the parent implementation first.
+	 * @throws InvalidConfigException
+	 */
+	public function init()
+	{
+		if ($this->label === null) {
+			throw new InvalidConfigException("The 'label' option is required.");
+		}
+		parent::init();
+		$this->addCssClass($this->options, 'btn-group');
+	}
+
+	/**
+	 * Renders the widget.
+	 */
+	public function run()
+	{
+		echo Html::beginTag('div', $this->options) . "\n";
+		echo $this->renderLabel() . "\n";
+		echo $this->renderItems() . "\n";
+		echo Html::endTag('div') . "\n";
+		$this->registerPlugin('button');
+	}
+
+	/**
+	 * Generates the button label.
+	 * @return string the rendering result.
+	 */
+	protected function renderLabel()
+	{
+		$label = $this->encodeLabels ? Html::encode($this->label) : $this->label;
+		$options =  array('class' => 'btn dropdown-toggle', 'data-toggle' => 'dropdown');
+		if ($this->split) {
+			$tag = 'button';
+			$label .= Html::tag('button', '<span class="caret"></span>', $options);
+			$options = array('class' => 'btn');
+		} else {
+			$tag = 'a';
+			$options['href'] = '#';
+		}
+		return Html::tag($tag, $label, $options);
+	}
+
+	/**
+	 * Generates the dropdown menu as specified on [[items]].
+	 * @return string the rendering result.
+	 */
+	protected function renderItems()
+	{
+		if (is_string($this->items)) {
+			return $this->items;
+		}
+		$config = array('items' => $this->items, 'clientOptions' => false);
+		return Dropdown::widget($config);
+	}
+}
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